we gave you a sneak peek of the john travolta and olivia newton-john video. that video has blown up online. they are still so hot. the song is called "i think you might like it." it is a real trip down memory lane. the song written by the same guy that wrote "you're the one that i want" from the classic film, "grease." and it's featured on their holiday album. all of the proceeds from the album benefit charity. and we're excited that john and olivia will be right here on "gma" to perform later this month. these two go together like shama-la-la-la-la. >> i sang while you were gone. >> how did that go again? ♪ ooh, ooh, ooh >> there you go. >> there's more. >> really? thank you. >>> hey, everybody. we have a "pop news" pop-in now. by now, most of us have seen the video of jay-z, on the subway, explaining who he was, for a woman who was unclear about the fuss around him. we showed it to you yesterday, in the piece about beyonce's documentary. that woman is a reporter in new york. we asked her about her experience. >> i didn't know who -- celebrities can't walk